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Preparation and Reactions of Sulfides

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.

Structure and Nomenclature of Thiols and Sulfides

Structure and Nomenclature of Thiols and Sulfides

Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...

Sulfur Assimilation

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...

Electrophilic Aromatic Substitution: Sulfonation of Benzene

Electrophilic Aromatic Substitution: Sulfonation of Benzene

Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.

Preparation and Reactions of Thiols

Preparation and Reactions of Thiols

Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.

The Sulfur Cycle

The Sulfur Cycle

Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...

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Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in PolyS-Divinylbenzene

Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in PolyS-Divinylbenzene

Published on: May 20, 2019

El traje[4]ane

Wenqi Liu¹, Charlotte L Stern¹, J Fraser Stoddart^1,2,3

¹Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.

Journal of the American Chemical Society

|May 19, 2020

Resumen

Este resumen es generado por máquina.

Los investigadores crearon un nuevo traje basado en porfirina [1] utilizando una técnica de navegación molecular en una botella. Esta molécula mecánicamente interconectada presenta un núcleo de porfirina encapsulado dentro de un ciclófano a través de un mecanismo de deslizamiento.

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Área de la Ciencia:

Química supramolecular
Ingeniería mecánica molecular

Sus antecedentes:

Las moléculas mecánicamente entrelazadas (MIM) son arquitecturas complejas con propiedades únicas.
La síntesis "barco en botella" de los MIM, en particular los suitanes, presenta desafíos sintéticos significativos.

Objetivo del estudio:

Para sintetizar un nuevo traje basado en porfirina[4]ane.
Para demostrar el mecanismo de "deslizamiento" para construir esta arquitectura molecular desafiante.

Principales métodos:

Síntesis de un precursor de la porfirina con ligandos sobresalientes.
Encapsulación de la porfirina dentro de un ciclófano octacacional tricíclico mediante un mecanismo de deslizamiento controlado por la temperatura.
Espectroscopia de resonancia magnética nuclear de protones dinámicos (1H NMR) para estudiar el movimiento molecular.

Principales resultados:

Síntesis exitosa de un traje basado en porfirina.
Demostración del mecanismo de deslizamiento para el encapsulamiento fácil de la porfirina.
Observación del movimiento de balanceo rápido de la porfirina encapsulada dentro de la cavidad del ciclófano.

Conclusiones:

El estudio informa de un nuevo traje basado en porfirina, que avanza en el campo de las moléculas mecánicamente entrelazadas.
El mecanismo de deslizamiento ofrece una ruta eficiente para construir arquitecturas moleculares complejas.
El comportamiento dinámico de la porfirina encapsulada destaca las propiedades únicas de estos sistemas.